Improvement in lamps



. c. w. "CAHOON.

Lanip.

Patented Oct. 13, 1863.

UNITED STATES PATENT Germs.

CHARLES NV. OAHOON, OF PORTLAND, MAINE.

IMPROVEMENT IN LAMPs.

Specification forming part of Letters Patent No. 40,2411, dated October13, 18.3.

To all whom, it may concern:

Be it known that 1, CHARLES W. OAHOON, of Portland, in the county ofCumberland and State of Maine, have invented certain new and usefulImprovementsin Lamps; and I do hereby declare that the following is afull, clear, and exact description of my said invention, reference beinghad to the accompanying drawings, in which Figure 1 represents a sideelevation of a lamp embodying my improvements. Fig. 2 represents avertical section of the same through the center of the handle. Fig. 3represents a top view of the burner, with the clamp-ring in section.Fig. 4 represents an elevation ofa portion of thelamp, looking over thehandle; and Fig. 5 represents avertical section of a part of the lampfollowing the line or w of Fig. 3.

My present invention consists of certain improvements in lamps, whichare represented in the accompanying drawings as applied to a lamp withavibratable chimney-holder.

The object of the first part of my invention is to enable the support ofthe chimney-holder, although constructed separately from the burner andclamped upon it, to be rigidly se-- cured thereto, so that it will notturn thereon,

and consists in combining the two by means of a tooth upon one andareeess in the other, in addition to the clamp-fastening.

The second part of my invention consists in a perforated corrugatedairchamber, which is light, ornamental, and rigid, and which takes theplace of the non-perforated corrugated air-screen and smooth perforatedairchamber previously used in such lamps, a single device thus takingthe place of the two devices previously used.

The object of the third part of my invention is to prevent thechimney'holder, when secured to the burner, from be1n g bent laterallyin unscrewing the burner from the collar of the lamp and screwing itfast again, and consists in combining the chimney-holder with twotonguesone on each side of the burner-which bear laterally against theburner or some piece secured thereto, and prevent the chimney-holderfrom being bent out of place by unscrewing and screwing in the burner.

The fourth part of my invention is important in a' lamp in which thesupport of the chimney-holderis screwed to the burner, and

its objectis to limit the distance to which the lamp and limits thedistance to which the burner can be screwed into the collar.

The lamp represented in the accompanying drawings has a collar,A,intowhich the burner B is screwed, and the burner has the support 0 of thechimney-holder d clamped upon it. The chimney-holder in this example isvibratable upon a pivot, e; and in order to prevent it from moving whilethelamp is carried about a curved friction-spring, f, is secured to it.This friction-spring consists of a ring-formed plate of metal, doubledup so that a half-circular plate embraces each side of the support c ofthe chimney-holder, and, bearing against it by the s1 ring of the metal,furnishes sufficient friction to prevent the 000' free movement of thechimney-holder. The two sides of this spring are pinched closelytogether at a short distance, i, from the bend, so as to form stopswhich prevent the chimney from being vibrated so far as to turn itsupper end downward. The support of the chimneyholder has a ring-base, m,which is clamped upon the rim of the burner B by a rivet, n, andin orderthat it may not turn upon the burner when an eflort is made to unscrewthe latter from its collar, the two are further secured by a tooth, s,which enters into a recess, it, made in the rim of the burner. Thistooth is readily formed in the manner represented in the drawings, byindenting the exterior of the rin g clam p, and thus causing acorresponding protuberance or tooth upon its interior.

The air-chamber H of the lamp is made fast to the'chimney-holder and iscorrugated, so that it is very rigid, although of but light weight. Itis also perforated, to permit the entrance of air, and thus takes theplace of the solid corrugated air-screen and plain perforated airchamber found in previous lamps. As the air-chamber is screwed to thechimneyholder, the application of the hand to the former for the purposeof unscrewing the burner from its collar tends to bend thechimney-holder laterally from its central position over the wick-tube.In order to prevent such lateral bending, two tongues, 0000, at theopposite sides of the lower edge of the air-chamber, are bent inward, sothat their points embrace the ring base m of the support ofthechimneyholder, wh'ch is clamped upon and sustained by the rim of theburner; hence, when an effort is made to unscrew the burner or to screwit into place, one of these tongues, hearing against the base on,prevents the lateral bending and consequent distortion of thechimney-holder. It is not necessary that these tongues should be bent infar enough to touch the burner or the part against which they are tobear, as the elasticity of the chimney-holder will permit a certainamount of lateral movement without permanent distortion, and when theforce is removed theparts willreassumetheirpositions. Asthesetonguesform part of a series which are made around the lower edge of theair-chamber for ornament, the bending of two of them inward to resistthe lateral distortion of the chimney holder, to which the air-chamberis secured, is aver-y simp e and cheap means of producing the requiredresult.

In makinglamps in quantities, itis not easy to secure the collars tothelamps in such manner that the ehimney'holders of all the lamps willoccupy the same positions in reference to the handles hence, the supportof the chimney-holder will not always project over the handle of thelamp (which is the place it should occupy) when the burner is screwed into the full extent of its screw. I obviate this defect by theapplication ofa stop, which prevents the further turning of the burnerafter the chimney-holder has arrived over the handle of the lamp (orother position whereit is desirable to have it) during the last turn ofthe screw. This stop, in the present case, is made adjustable, andconsists of a screw, z, which is screwed through the burner so that itsprojecting lower end can bear against the upper surface of the collarAot the lamp. The mode of adjusting this stop is as follows: When theburner is first applied to the collar of the lamp, it is screwed down toits full extent. It is then screwed back a fraction of a revolution,sufficient to bring the support 0 of the chimney-holder over the handleI. Then the screw stop 2 is screwed down until its lower end bears uponthe collar A. The end of the screw thus limits the distance to which theburner can be screwed intothecollar, and stops it always with thechimney-holder thumb-plate g over the handle of the lamp in a convenientposition to be moved. Such a stop may be used in lamps withoutchimneyholders, where, for some other reason, it may be desirable tostop the turning of the burner at a certain point.

The parts of the lamp which have not been described are sufficientlyrepresented in the drawings to show their connection with the parts towhich my invention pertains.

Having thus described a lamp embodying my improvements, what I claim asmy invention, and desire to secure by Letters Patent, is-

1. The combination of the clampsupport of the chimney-holder with theburner by means of a tooth and recess to prevent the support fromturning upon the burner, substantially as set forth.

2. A perforated corrugated air-chamber for a lamp, constructedsubstantially as set forth.

3. The combination of the chimney-holder with two tongues to bearagainstthe opposite sides of the burner or some part secured thereto,and prevent the bending of the chimneyholder laterally by the unscrewingor screwin g in of the burner, substantially as set forth.

4. The combination of the burner, which is connected with the collar ofthe lamp by a screw-thread, with a stop, which limits the distance towhich the burner can be screwed into the collar of the lamp,substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

CHAS. W. CAHOON.

Witnesses:

J. B. OAHooN, M. G. OAHOON.

